animals were almost certainly harmed by both their own and their mother's exposures, which would account for the increased mortality of young lambs ebserved. The data is scanty and the estimates admittedly rough, but this conclusion seems reasonable. It is felt that these exposures constitute a clear example of the internal hazard from fission product fall-outs in which protracted inzestion of the material mey take place. Although this hazard is of course maxinized for a grazing animal, tha relevance of these expo= sures to such human problems as water supply and crop contamination should not. be overlooked. OM G. A. SONDHAUS 26 a DO® ARCHIVES